<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id$

import("ORG.Util.ArrayList");

/**
 +------------------------------------------------------------------------------
 * Stack实现类
 +------------------------------------------------------------------------------
 * @category   ORG
 * @package  ORG
 * @subpackage  Util
 * @author    liu21st <liu21st@gmail.com>
 * @version   $Id$
 +------------------------------------------------------------------------------
 */
class Stack extends ArrayList
{//类定义开始

/**
 +----------------------------------------------------------
 * 架构函数
 +----------------------------------------------------------
 * @access public
 +----------------------------------------------------------
 * @param array $values  初始化数组元素
 +----------------------------------------------------------
 */
public function __construct($values = array())
{
	parent::__construct($values);
}

/**
 +----------------------------------------------------------
 * 将堆栈的内部指针指向第一个单元
 *
 +----------------------------------------------------------
 * @access public
 +----------------------------------------------------------
 * @return mixed
 +----------------------------------------------------------
 */
public function peek()
{
	return reset($this->toArray());
}

/**
 +----------------------------------------------------------
 * 元素进栈
 +----------------------------------------------------------
 * @access public
 +----------------------------------------------------------
 * @param mixed $value
 +----------------------------------------------------------
 * @return mixed
 +----------------------------------------------------------
 */
public function push($value)
{
	$this->add($value);
	return $value;
}

}//类定义结束
?>
